Ultra short wave device



Aug. 20, 1940. E. GossEL ET A1.

ULTRA SHORT WAVE DEVICE Filed sept. 1o', 1937 Patented Aug. zo, 1940 2,212,231

UNETE STATES FATNT @ENCE ULTRA SHORT WAVE DEVICE Erich Gossel and Werner Puhlmann, Berlin, Germany, assigncrs to C. Lorenz Aktiengesellschaft, Berlin-Tempelhof, Germany, a company Application September 10. 1937, Serial No. 163,254 In Germany September 5, 1936 2 Claims. (Cl. Z50- 16) The invention is Concerned with the construcpoint is adjusted or displaced automatically in tion of ultra short wave oscillatory vacuum tube accordance with variations of the capacity of circuit devices such as receivers and oscillation condenser 2. To such end the assembly 5, E, i3 generators. An object of the invention is to is moved by a cam disc 9 mounted on a shaft 2li provide for a particularly convenient arrangegeared to a tuning knob I2 by toothed Wheels Il, 5

ment of the individual parts thereof. One emand this knob is connected also with the dielecbodiment of the invention is described hereafter tric I3 of the condenser 2 by a screw l5 and an by way of example, reference being had to the internally threaded sleeve 24 in engagement with accompanying drawing in which l screw l5 and xed to the dielectric I3 by a pin 10 Fig. 1 is an elevation of such embodiment 25, for instance. A spring lll acts to press the 10 while Fig. 2 shows a section on line A-B of Fig. l. member 5 against disc 9. The means for movrThe device described by way of example is of ing the assembly 5, 6, 8 has been made in the the kind having the oscillatory circuit located shape of a cam disc or curve disc because the between anode and grid. However, it is to be displacement of the neutral point need not ocunderstood that th-e principles of the invention cur in linear relation with variations of the caare suitable to be adopted with circuit arrange pacity of condenser 2. In order to avoid a movments of any type available in this regard. able current supply means this condenser is con- In a block I, made of a low-loss insulating structed with its plates or electrodes Xed while material, an electron tube 23 of the kind desthe dielectric I3 is displaceable. These plates are ignated as acorn tube is mounted. Block I also constituted by the electrodes Ill which are of a 2O carries the other operative means, fastened to somewhat semicircular cross-sectional area and it, such as a tuning condenser 2, a grid leak reare arranged to encompass the dielectric I3 sistance 3 and an U-shaped wire or metal bow made in the shape of a cylinder. Such cylinder 4 that serves as a self-inductance. This block is or core I3 is covered With a thin metal layer II 25 preferably rectangular, or nearly so, and is and this is coated with an insulating layer IB 25 mounted with one end face on a base plate 22. which is very thin and has an extremely high The anode current is supplied over a contact dielectric constant. This layer I is of an inmember 5 adapted to slide on bow il, that is to sulating material which is highly wear-resist- Say, along one limb thereof. Contact member 5 ant from a mechanical standpoint and which is fastened in a slide 5 which is guided in a has very low dielectric losses from an electrical 30 S101? 2l DI'OVded in a Sheet mel/2J plate 01 Wall standpoint. Condenser 2 thus comprises the l. Slide S is held in engagement With SlO'G 2l parts I3, I I, I8. Layer Il serves to very greatly by a Spring 8 which is in engagement with memshorten the path of the electrostatic eId and ber 5 while resting against plate l, the anode thereby greatly to increase the capacity of the current supply means 5, Ui, 8 thus being in eleccondenser. By turning ythe knob I2 the structure 35 trical contact with plate l which is of a com- I3, Il, I8 is displaced longitudinally, that is, paratively large area. as will be seen especially along the axis of the parts la, thus varying the in Fig. 1. In this way the anode current supply capacity of the condenser 2. means is stabilized in potential by the capacity By constructing the condenser suitably a lin- 40 to ground of the large area thus preventing this ear frequency variation is obtainable, that is to 40 means from incurring electric oscillations and say, it is possible to attain a constant rate of thereby taking energy from the oscillatory circhange of frequency with respect to rotation of cuit itself. Bow ll is variable in its effective knob I2 within the frequency range of the oslength, being mounted in sockets 25 in which it cillatory circuit. This result may be attained by can be displaced. One of these sockets it is anon-linear capacity variation of the condenser, 45 integral with one of the condenser electrodes such capacity variation being caused for instance, IA. By adjusting bow I in its sockets 26 the by varying the width of the slots by which the initial point of the calibration curve can be adelectrodes I 4 are spaced from each other, that justed on replacing the tube 23. It is necessary is to say, by varying the effective surface of the to displace the anode supply point, that is, the electrodes I4. 50 point in which member 5 contacts with bow Il, Conductors I9 are the leads to the cathode for the reason that the neutral point changes and heating device of tube 23. These leads are in accordance with frequency variations. It has short-circuited to ground with respect to high been usual to adjust the neutral point manually. frequencies by making them in the shape of With devices as provided by the invention this tapes constituting the individual plates or elec- 55 trodes of a multiple condenser Whose common plate 2B is connected to earth. Plate i also serves as an angle bracket by Which block i and plate 22 arel fastened to each other.

What is claimed is:

1. An ultra short Wave radio set including a block of insulation, a recess in said blockto re- Ceive an electron oscillator tube, Contact members for the tube fastened directly to said block, a tuning condenser having a pair of electrodes rigidly fastened to said block, one of said electrodes being directly connected with that one of said contact members Which is positioned to engage the grid of said tube, a tuning inductance comprising a bow-shaped metal member and a corresponding pair of metal supports telescopically tting the ends of said metal member, one of said supports being directly connected to that one of said contact members adapted to engage the plate of said tube and the other of said supports being directly connected to. the other one of said condenser electrodes, means to apply anode current including a contact disposed in direct adjustable sliding connection with one of the arms of said bow-shaped inductance, operating means for adjusting said sliding Contact along said bowshaped inductance, further operating means for adjusting the capacity of said condenser, and an adjusting shaft common to both said operating means.

2. An ultra short Wave radio set including a block of insulation, a recess in said block to receive an electron oscillator tube, contact members for the tube fastened directly to said block, a tuning condenser having a pair of electrodes rigidly fastened to said block, one of said electrodes being directly connected with that one of said contact members which is positioned to engage the grid of said tube, a tuning inductance comprising a bow-shaped metal member and a corresponding pair of metal supports telescopically itting the ends of said metal member, one of said supports being directly connected to that one of said contact members adapted to engage the plate oi said tube and the other o1" said supports being directly connected to the other one of said condenser electrodes, means to apply anode current including a contact disposed in direct adjustable sliding connection with one of the arms of said bow-shaped inductance, operating means including a cam and a spring-pressed follower connected to said sliding Contact ior ad justing said sliding conta-ct along said bow-shaped inductance, further operating means for adjusting the capacity of said condenser, and an operating shaft common to both said operating means.

ERICH GossEL. WERNER PUHLMANN. 

